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At present, there are roughly three categories of products derived from RFID technology: passive RFID products, active RFID products, and semi-active RFID products.
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Passive RFID products have the earliest development, and are currently the most mature and widely used products. For example, bus cards, canteen meal cards, bank cards, hotel access cards, second-generation ID cards, etc., which can be seen everywhere in our daily life, belong to the category of close contact recognition. The main operating frequencies of its products are low frequency 125KHZ , high frequency 13.56MHZ , UHF 433MHZ , and UHF 915MHZ .
Active RFID products have been slowly developed in recent years, and their long-distance automatic identification characteristics determine their huge application space and market potential. At present, there are major applications in the field of remote automatic identification, such as smart prisons, smart hospitals, smart parking lots, smart transportation, smart cities, smart earth, and the Internet of Things. Active RFID has suddenly emerged in this field, belonging to the category of long-distance automatic identification. The major products have the operating frequency UHF 915MHZ, microwave 2.45GHZ.
Different characteristics of active RFID products and passive RFID products determine different application fields and different application modes, and they also have their own advantages. However, in this system, we focus on introducing semi-active RFID products between active RFID and passive RFID . This product integrates the advantages of active RFID and passive RFID . In access control management, personnel can be accurately positioned. , Area positioning management, perimeter management, electronic fences and security alarms have great advantages. Guide: Access control system for PROFINET bus and RFID card reader identification in a paint shop of an automobile factory
Semi-active RFID products, combined with the advantages of active RFID products and passive RFID products, under the trigger of the low frequency 125KHZ frequency, let microwave 2.45G play its advantage. Semi-active RFID technology, which can also be called low-frequency activation trigger technology, uses low-frequency short-distance precise positioning, microwave long-distance identification and data upload to solve the functions that pure active RFID and passive RFID can not achieve. Simply put, it is to activate positioning at a short distance, identify and upload data at a long distance.
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Semi-active RFID is a flexible application technology that is easy to control, simple and practical, and especially suitable for automatic control. The identification work does not require manual intervention. It can support both read-only working mode and read-write working mode without contact Or aiming ; can work freely in a variety of harsh environments, short-distance radio frequency products are not afraid of oil stains, dust pollution and other harsh environments, and can replace barcodes, such as tracking objects on the assembly line of factories ; long-distance radio frequency products are mostly used in traffic, The recognition distance can reach tens of meters, such as automatic toll collection or vehicle identification. Guide: rfid automated production line application: factory production line RFID intelligent management system
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